your dog in fable two can transform in to a different dog i always liked the huskey each one cost at least 10000 gold it also raises your dogs fight ability to 5 star. it can be the following

the huskey in the beginning the bull dog mid game delmation after the spire normal dog potion at anytime excuse my spelling. and you must have the see the future quest which cost 580 if i remember correctly xbox points. if i am wrong please correct it thank you.